Horatio o



H. 0. PERRY.

V Screw Propeller.

No. 22,266. Patented Dec. 7, 1858.

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Nv PETERS Phnln-Lilhognphar, Waihingium D. C.

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UNITED STATES PATENT FFICE.

HORAIIO O. PERRY, OF BUFFALO, NEW YORK, ASSIGNOR TO HIMSELF AND SIDNEY SHEPPARD, OF SAME PLACE.

MEANS FOR SECURING THE ARMS TO THE HUBS OF PROPELLERS.

Specification forming part of Letters Patent No. 22,266, dated December 7, 1858; Reissued April 28,

To all whom it may concern:

Be it known that I, Honx'rio O. PERRY, of Buffalo, in the county of Erie and State of New York, have invented certain new and Improved Means of Securing the Arms to the I-Iubs in Screw-Propellers; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying draw ings, and to the letters marked thereon, in which- Figure 1 is a plan view. Fig. 2 is an end elevation of my screw or propelling wheel complete. Fig. 3 is a section of a portion on line S S in Fig. 2. Fig. a is a view showing the arrangement of the keys alone. Fig. 5 is a view showing the arrangement of the keys when 5 arms and keys are employed. Fig. 6 is a similar view showing the arrangement when but 3 arms are used.

, Similar letters of reference refer to like parts in all the drawings.

The nature of my invention consists in fitting the arms into conical sockets in the hubs, and in confining the parts together by keys so arranged that the small end of the second key extends across the head of the first, the small end of the third extends across the head of the second, and the small end of the fourth across the head of the third, so that none of the other keys can by any chance be displaced until the fourth has been first removed.

To enable others skilled in the art to make and use my invention I will proceed to describe its construction and operation by the aid of the drawings.

A is the shaft of the propeller.

B is the hub or central boss constructed as represented with four stout' bosses or short branches B in each of which is a tapering socket to receive a corresponding end of one of the arms or blades C C C C. The keys D D D D are tapered very slightly and are very strongly fitted in the transverse seats represented, so that each key serves to confine its respective arm into its socket, while each with the exception of the first also serves to confine a neighboring key.

In constructing my improved screw or propelling wheel, I first take care that the parts are properly cast and truly finished and the central casting B firmly secured upon A. I then insert the conical extremity of one of the arms G into one of the corresponding sockets in B, and drive the kev D, which must be too short to stand in tlfe path of either of the other keys. I then insert the next arm and drive the key D taking care to drive each key very firmly to its proper place. This key D must be of such proportions that when fairly driven its widest end is out of the path or wake of the next key D while its narrowest end extends partly across the end of, and confines, D. I then insert the next arm and drive D in the same manner, so that D confines D I then insert the last arm and drive D after which I confine the last key D* by any ordinary means. \Vhen it is desired to remove all or any one of the arms from my wheel, the process above described or a portion thereof is reversed.

The object of my invention is to cheapen the construction. increase the strength and diminish the volume, and also to diminish the liability to derangement, of the parts of a propeller. The means by which blades have been heretofore connected and discon nected are objectionable. lVhen the blades are riveted to the arms it involves great labor to separate them and still more labor and skill properly to connect again. hen bolts and nuts or any of the more complicated devices are used, these difficulties are but little diminished while new and serious ones are involved. The various expedients for feathering the blades are objectionable on account of the bulk of the mechanism at the center as also from the liability of the parts to become deranged.

I am not aware that-conical sockets in the hub, and corresponding conical ends on the arms, with keys arranged in the manner herein described and represented have ever been before employed. I have found by experience that the connection of arms to the hub in my invention is very strong and im movable and that a separation of the parts is effected with less labor and the substitution of other arms previously prepared is performed in less time than by any other invention for the purpose.

IVIy invention may be applied without difficulty where any number of arms greater than two are employed. Fig. 5 is an example showing the arrangement of the keys where five arms are employed and Fig. 6

shows the arrangement Where only three confined in the corresponding sockets in B 10 arms are used. by the keys D, D D etc., substantially in I do not confine myself to any precise dethe manner and for the purposes above set gree of talper to the conical ends of my forth. arms nor c o I confine m self to the em 10 r T ment of four arms. But p y HORAFIO PERRX Having now fully described my improvement What I claim as my invention is- The employment of the conical ends C Vitnesses Var. M. SLoANn, JNo. D. SHEPARD.

[FIRST PRINTED 1911.] 

